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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Xml.Linq;
using Ogdi.InteractiveSdk.Mvc.Models;
using Ogdi.InteractiveSdk.Mvc;
using Ogdi.InteractiveSdk.Mvc.Repository;

namespace Ogdi.InteractiveSdk.Mvc.Repository
{
    /// <summary>
    /// This Repository will have the methods to manage the EntitySet.cs model 
    /// for the list of datasets.
    /// </summary>
    internal class EntitySetRepository
    {
        #region Public Methods

        /// <summary>
        /// This method fetches the EntitySets for the given parameters
        /// </summary>
        /// <param name="containerAlias">alias of the container</param>
        /// <param name="categoryName">name of the category</param>
        /// <returns>returns list of EntitySet</returns>
        internal static IList<EntitySet> GetEntitySets(string containerAlias, 
            string categoryName)
        {

            //  Set filter default value to null
            string filter = null;

            //  If any particular category is selected then ...
            if (categoryName != null)
            {
                //  create filter 
                filter = "category eq '" + categoryName + "'";
            }


            // Declare List<EntitySet> that will have list of EntitySet objects
            List<EntitySet> entitySetList = null;
            // 1000 is the max results Azure Table Storage allows per query
            if (!(String.IsNullOrEmpty(containerAlias)))
            {

                XElement entitySetXML = Helper.ServiceObject.GetData(
                    containerAlias, 
                    Resources.EntitySetTableName, filter, 
                    Convert.ToInt32(Resources.EntitySetPageSize, 
                    CultureInfo.InvariantCulture),
                    null, null);

                // Define entitySetList
                entitySetList = new List<EntitySet>();
                if (entitySetXML != null)
                {
                    // Get unique EntitySets
                    // For all categories
                    
                    var lstEntitySets = (from element in entitySetXML.Elements("properties")
                                         select new EntitySet
                                                (   element.Element("name").Value,
                                                    element.Element("category").Value,
                                                    element.Element("description").Value,
                                                    element.Element("source").Value,
                                                    new Uri(element.Element("metadataurl").Value),
                                                    element.Element("entityset").Value,                                                    
                                                    containerAlias
                                                 )
                                        ).Distinct();

                    entitySetList = lstEntitySets.ToList<EntitySet>();                    
                    entitySetList.Sort();
                }
            }
            // Return entitySetList
            return entitySetList as IList<EntitySet>;
        }

        #endregion
    }
}
